Straps & sizing · updated November 2026

Seiko 5 Sports lug width by case

Seiko 5 Sports uses several case sizes, and the strap width changes with them. Find yours below.

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The short answer

It depends on the case. In Seiko's current range, the 42.5 mm SKX-style cases take 22 mm, the 38–40 mm cases mostly take 20 mm, and the smallest 36–37 mm cases take 18 mm. Look up your exact reference in the table.

By case family

Family	Lug width	Refs	Examples
SKX series (42.5 mm)	22 mm	27	HDB003 · HDB004 · HDB005 · SBSA281 · SBSA315 · SRPD51…
Field series (39.4 mm)	20 mm	14	HDB001 · HDB002 · SRPG27 · SRPG29 · SRPG31 · SRPG35…
SNXS series (37.4 mm)	18 mm	6	SRPK87 · SRPK89 · SRPK91 · SRPL55 · SRPL57 · SRPL59
SKX series (38 mm)	20 mm	6	SRPK29 · SRPK31 · SRPK33 · SRPL77 · SRPL79 · SRPM07
Field series (41 mm)	20 mm	4	HDB006 · HDB007 · HDB008 · HDB009
SNXS series (32 mm)	15 mm	3	SRE021 · SRE023 · SRE024
Field series (36.4 mm)	18 mm	3	HDB010 · SRPJ81 · SRPJ85
Other 5 Sports (42.5 mm)	22 mm	3	HDB011J8 · HDB012J8 · SRPD55
SKX series (28 mm)	14 mm	2	SRE003 · SRE004
SKX series (38.2 mm)	20 mm	1	SRPL93
SKX series (40 mm)	20 mm	1	SRPE57

Comparing the SKX-style models? Read SKX007 vs SRPD55 vs SSK001.


SRE003	Seiko 5 Sports · SKX series	14 mm	28 mm	33.1 mm	11.2 mm	–	–
SRE004	Seiko 5 Sports · SKX series	14 mm	28 mm	33.1 mm	11.2 mm	–	–
SRE021	Seiko 5 Sports · SNXS series	15 mm	32 mm	38.7 mm	11.4 mm	Bracelet	–
SRE023	Seiko 5 Sports · SNXS series	15 mm	32 mm	38.7 mm	11.4 mm	Bracelet	–
SRE024	Seiko 5 Sports · SNXS series	15 mm	32 mm	38.7 mm	11.4 mm	Bracelet	–
HDB010	Seiko 5 Sports · Field series	18 mm	36.4 mm	44.4 mm	12.5 mm	Nylon	–
SRPJ81	Seiko 5 Sports · Field series	18 mm	36.4 mm	44.4 mm	12.5 mm	Bracelet	–
SRPJ85	Seiko 5 Sports · Field series	18 mm	36.4 mm	44.4 mm	12.5 mm	Nylon	–
SRPK87	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPK89	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPK91	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPL55	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPL57	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPL59	Seiko 5 Sports · SNXS series	18 mm	37.4 mm	44.7 mm	12.5 mm	Bracelet	–
SRPK29	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPK31	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPK33	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPL77	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPL79	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPM07	Seiko 5 Sports · SKX series	20 mm	38 mm	44.2 mm	12.1 mm	Bracelet	–
SRPL93	Seiko 5 Sports · SKX series	20 mm	38.2 mm	44.7 mm	12.3 mm	Bracelet	–
HDB001	Seiko 5 Sports · Field series	20 mm	39.4 mm	47.9 mm	13.6 mm	Bracelet	–
HDB002	Seiko 5 Sports · Field series	20 mm	39.4 mm	47.9 mm	13.6 mm	Bracelet	–
SRPG27	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Bracelet	–
SRPG29	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Bracelet	–
SRPG31	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Nylon	–
SRPG35	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Nylon	–
SRPG37	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Nylon	–
SRPG39	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Cow leather	–
SRPG41	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Cow leather	–
SRPH33	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	13.2 mm	Nylon	–
SRPM09	Seiko 5 Sports · Field series	20 mm	39.4 mm	48.1 mm	11.6 mm	Bracelet	–
SSK023	Seiko 5 Sports · Field series	20 mm	39.4 mm	47.9 mm	13.6 mm	–	–
SSK025	Seiko 5 Sports · Field series	20 mm	39.4 mm	47.9 mm	13.6 mm	Cow leather	–
SSK059	Seiko 5 Sports · Field series	20 mm	39.4 mm	47.9 mm	13.6 mm	Bracelet	–
SRPE57	Seiko 5 Sports · SKX series	20 mm	40 mm	44.6 mm	11.5 mm	Bracelet	–
HDB006	Seiko 5 Sports · Field series	20 mm	41 mm	48.5 mm	13.2 mm	Bracelet	–
HDB007	Seiko 5 Sports · Field series	20 mm	41 mm	48.5 mm	13.2 mm	Bracelet	–
HDB008	Seiko 5 Sports · Field series	20 mm	41 mm	48.5 mm	13.2 mm	Nylon	–
HDB009	Seiko 5 Sports · Field series	20 mm	41 mm	48.5 mm	13.2 mm	Nylon	–
HDB003	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.9 mm	Bracelet	–
HDB004	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	14.2 mm	Bracelet	–
HDB005	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	14.2 mm	Bracelet	–
HDB011J8	Seiko 5 Sports	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
HDB012J8	Seiko 5 Sports	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SBSA281	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Nylon	–
SBSA315	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Nylon	–
SRPD51	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD53	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD55	Seiko 5 Sports	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD59	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD63	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD65	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPD79	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Nylon	–
SRPD91	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Nylon	–
SRPD93	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Silicone	–
SRPD95	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Silicone	–
SRPJ45	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.4 mm	Bracelet	–
SRPK97	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	14.2 mm	–	–
SRPK99	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	14.2 mm	Bracelet	–
SRPL83	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.9 mm	Bracelet	–
SRPL85	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.9 mm	Bracelet	–
SRPL87	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.9 mm	Silicone	–
SRPL89	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.9 mm	Silicone	–
SSK001	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Bracelet	–
SSK003	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Bracelet	–
SSK005	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Bracelet	–
SSK033	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Bracelet	–
SSK035	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Bracelet	–
SSK036	Seiko 5 Sports · SKX series	22 mm	42.5 mm	46 mm	13.6 mm	Cow leather	–

Click a column heading to sort. n/p = not published by the brand. Quick-release "Yes" only where the brand page says so; "–" means not stated, not "no".

Which strap type?

Rubber or silicone: the practical choice for swimming and hot weather. It doesn't absorb water and rinses clean.
Fabric single-pass or two-piece nylon: light and cheap. A single-pass strap runs under the case, which adds a little height on the wrist.
Leather: dressier, but water and sweat shorten its life. Keep it off dive watches you actually swim with.
Steel bracelet: the most durable, but aftermarket bracelets need end links shaped for the specific case, which brands rarely publish. Buy one listed for your exact reference.

Spring bars: what Seiko doesn't publish

Seiko lists lug width, but not spring-bar diameter or a strap code. Aftermarket straps vary in how large their spring-bar holes are, so before you buy, check the strap's stated hole size against the bars you'll use, or reuse the original bars if they fit. See our spring bars and tools guide.

Shop straps

22 mm straps on Amazon 20 mm straps on Amazon 18 mm straps on Amazon

Paid links to Amazon search results. Check the listed width and spring-bar hole size against the table above.

Questions

What lug width is the Seiko 5 Sports?

18, 20 or 22 mm depending on case size. The 42.5 mm SKX-style models such as the SRPD55 are 22 mm.

What lug width is the SRPD55?

22 mm, per Seiko.

What lug width is the SRPK29?

20 mm, per Seiko.

What lug width is the SRPK91?

18 mm, per Seiko.

Will an SKX007 strap fit a Seiko 5 Sports?

Only the 22 mm models, such as the 42.5 mm SKX-style cases.

Not sure? Try Watch Finder →

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